问python烧瓶中的全局变量声称它是在使用它的5个函数中的一个之前被引用的。

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File "/home/jsnyder10/Documents/45/flask/lib/python2.7/site-packages/flask/app.py", line 1997, in __call__
    return self.wsgi_app(environ, start_response)
File "/home/jsnyder10/Documents/45/flask/lib/python2.7/site-packages/flask/app.py", line 1985, in wsgi_app
    response = self.handle_exception(e)
File "/home/jsnyder10/Documents/45/flask/lib/python2.7/site-packages/flask/app.py", line 1540, in handle_exception
    reraise(exc_type, exc_value, tb)
File "/home/jsnyder10/Documents/45/flask/lib/python2.7/site-packages/flask/app.py", line 1982, in wsgi_app
    response = self.full_dispatch_request()
File "/home/jsnyder10/Documents/45/flask/lib/python2.7/site-packages/flask/app.py", line 1614, in full_dispatch_request
    rv = self.handle_user_exception(e)
File "/home/jsnyder10/Documents/45/flask/lib/python2.7/site-packages/flask/app.py", line 1517, in handle_user_exception
    reraise(exc_type, exc_value, tb)
File "/home/jsnyder10/Documents/45/flask/lib/python2.7/site-packages/flask/app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
File "/home/jsnyder10/Documents/45/flask/lib/python2.7/site-packages/flask/app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
File "/home/jsnyder10/Documents/45/flask/lib/python2.7/site-packages/flask_login/utils.py", line 228, in decorated_view
    return func(*args, **kwargs)
File "/home/jsnyder10/Documents/jMessage/app/views.py", line 66, in admin_edit_groups
    if not g.user.admin:
UnboundLocalError: local variable 'g' referenced before assignment

from flask import render_template, flash, redirect, session, url_for, request, \
    g, jsonify, send_from_directory

@app.route('/admin', methods=['GET', 'POST'])
@login_required
def admin():
    if not g.user.admin:
        flash('Page unacessible.')
        return redirect(url_for('index'))
    return render_template('admin.html',title='Admin') 

@app.route('/admin_edit_groups', methods=['GET', 'POST'])
@login_required
def admin_edit_groups():
    if not g.user.admin:
        flash('Page unacessible.')
        return redirect(url_for('index'))
    form = AddGroupForm()
    if request.method == 'POST' and form.validate():
        if not Group.query.filter_by(name=form.groupname.data).count()>0:
            g=Group(name=form.groupname.data)
            db.session.add(g)
            db.session.commit()
            flash('Added Group name ' + form.groupname.data)
        else:
            flash('Group: ' + form.groupname.data + ' already exists.')
    groups=Group.query.all()
    return render_template('admin_edit_groups.html',title='Admin', form=form, groups=groups)